MalwareHealthcareHealthcareRansomwareRansom DemandedData EncryptedIdentity (basic)Government IDMediumContained

MCLAREN HEALTH CARE CORPORATION

bd_16315e097bb33c70 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Aug 5, 2024

Filed

Jun 20, 2025

To disclose

46 weeks

Affected

Not disclosed

Linked

8 filings

Confidence

65%

Full breach record for MCLAREN HEALTH CARE CORPORATION →4 incidents on file

McLaren Health Care notified Vermont AG of a ransomware attack impacting patient networks between July 17 and August 3, 2024. The attack targeted McLaren and Karmanos systems. Data potentially exposed includes names and government identifiers. McLaren engaged forensic investigators, secured the network, and is offering identity theft protection services to affected individuals.

J jump to incidentP pin to compareR raw source

Vermont clock✗ VT AG >45 bday46 weeks discovery → filing

⚠ unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Incident timeline

undetected · 19 days

discovery → filing · 46 weeks / 319 days

Jul 17, 2024

Begins

Aug 5, 2024

Discovered

Jun 20, 2025

Filed

vs. sector median

+33 wks slower

This filing is one of 8 about the same incident.View merged incident

A leak claim by alphv about this victim predates this filing by 629 days.View originating leak claim

Linked disclosures

Why this link?

Regulatory filings (7) · sorted by filing gap

New Hampshire State AGbd_277031208ce9f1ec2025-06-20Verified
Indiana State AGbd_5ca789ddf9c80c462025-06-20Verified
Massachusetts State AGbd_e1f2148c0d56b32a2025-06-20Verified
Maine State AGbd_e56983ab307e30882025-06-20Verified

Show 3 more filings ↓up to 19d gap

HHS OCRbd_290c029e469208462025-06-24 · +4dVerified
Texas State AGbd_1484ed84002634352025-06-30 · +10dVerified
Illinois State AGbd_4885c58b706423f22025-06-01 · +19dCandidate

Name: MCLAREN HEALTH CARE CORPORATION
norm: mclaren health care
Domain: mclaren.org

Name: MCLAREN HEALTH CARE CORPORATION
norm: mclaren health care
Domain: mclaren.org
Industry: Healthcarellm

Discovered: Aug 5, 2024
Breach occurred: Jul 17, 2024 – Aug 3, 2024
Undetected for: 19 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jun 20, 2025
Affected individuals: Not disclosed
Data types: Identity (basic)Government ID
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for ImpactT1190 Exploit Public-Facing Application
Threat actor: ExternalFinancial
Regulator citations: Notice has not been delayed by law enforcement
Initial access: exploit_public_facing

During the incident: Activated emergency response processes
Launched an investigation with the assistance of a third-party forensic specialists
Secured our network
Maintained clinical operations in a safe and secure fashion
Undertook an extensive forensic review of the potentially impacted files
Offering identity theft protection services through IDX
Changes made: Review our existing policies and procedures
Implement additional administrative and technical safeguards
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 46 weeks(319 days from discovery to filing)
Compliance flags: VT AG >45 bdayLeak >180d
Discovery-date grounding: unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 8 filings · 8 states

View merged incident ↗

Illinois State AGJun 1 · first

New Hampshire State AG+19d

Indiana State AG+19d

Massachusetts State AG+19d

Maine State AG+19d

Vermont State AG+19d · this page

HHS OCR+23d

Texas State AG+29d

Pattern: first filing Jun 1 (IL), last Jun 30 (TX) — a 29-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://ago.vermont.gov/document/2025-06-20-mclaren-health-care-data-breach-notice-consumers
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jun 20, 2025
Raw hash: 2b951bd1d084d774ba046fa3993b8efdfa61946cb9379666c663569cfd397c6a

Linked disclosures

Regulatory filings (7) · sorted by filing gap

Reporting entityMCLAREN HEALTH CARE CORPORATION

Victim entityMCLAREN HEALTH CARE CORPORATION

Incidentdiscovered Aug 5, 2024

Stated responseActivated emergency response processes

ComplianceVT AG >45 bday

Extraction provenanceno artifact recorded

Source provenanceago.vermont.gov